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Not sure what you are trying to do here.
But to mount a linux server nfs share on solaris client, you must
download the max protocol version to 3.
At /etc/default/nfs
uncomment
NFS_CLIENT_VERSMAX and set it to version 3

Our user can access his linux servers/ clients aok but has a solaris server that he wants to use to get at the linux server that has our software loaded on it and to mount that linux server share to the solaris box he has so it and it's users can access and use the linux share that has our software on it to get at the software and data on the linux share .

On a solaris system we have in house if I go to /etc/default/nfs I see this -

It looks like our inhouse sol box doesn't have the VERSMAX and so if I do this on the users Solaris box that will mean that as you said he needs to download the NFS_CLIENT_WERSMAX to support NFS3 ( I don't know but if he could configure his LInux box to NFS4 then it sounds like the mount could work from his Solaris box as long as he didn't use ver=3?

The user I am trying to help had : NFS_CLIENT_VERSMAX=4 and I just asked him to change it to a 3. I didn't say he needs to restart his NFS service or reboot but I would guess he must do one or the other so the system recognizes the change ...I think.
The change is not seen on the fly somehow or the VERSMAX=3 that he will edit doesn't have a way to make the SOL10 OS "see" the change short of restart NFS or reboot?

Now I notice rup (remote uptime) will not work.
This is a solaris tool to gather remote uptime over rpc.
Sometimes it let's you know if rpc works or not.
But in this case, Linux rpc will not know how to handle it.

I did try the mount while leaving out th eproto=tcp and just got a bunch of retries instead of an immediate error message.
The port 2048 it turns out belobgs to the port of the apllication that is on the Linux server we are trying to mount to so we have to use port 2048.

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